CVE-2020-3527 Cisco Catalyst 9200 Series Switches Jumbo Frame Denial of Service Vulnerability

High 8.6 Published 24 Sep 2020 Updated 13 Nov 2024

Remote unauthenticated attackers can crash Cisco Catalyst 9200 switches by sending oversized jumbo frames to the management interface.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2020-3527?

CVE-2020-3527 is a high-severity denial of service vulnerability in Cisco Ios Xe, published on 24 Sep 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A vulnerability in the Polaris kernel of Cisco Catalyst 9200 Series Switches could allow an unauthenticated, remote attacker to crash the device. The vulnerability is due to insufficient packet size validation. An attacker could exploit this vulnerability by sending jumbo frames or frames larger than the configured MTU size to the management interface of this device. A successful exploit could allow the attacker to crash the device fully before an automatic recovery.

Weakness: CWE-400, CWE-20

Which versions are affected by CVE-2020-3527?

It affects 1 product.

Products include Cisco Ios Xe.

How do I fix CVE-2020-3527?

No fix has been published for CVE-2020-3527 yet. Limit exposure of the affected software until one is available.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2020-3527 being exploited?

There is no known exploitation of CVE-2020-3527 in the wild and no public exploit code.

All Cisco Ios Xe vulnerabilities

Sources

Also known as GHSA-wq7w-fc8m-6mr2.